Determination of transmitter distortion
a transmitter and distortion technology, applied in the direction of restoring means or bias distortion correction, dc level restoration means, instruments, etc., can solve the problems of transmitters that use digital signal processing modules, linear equalizers and cancellers, and are particularly sensitive to nonlinear distortion present in received signals, so as to produce more nonlinear distortion
Inactive Publication Date: 2006-06-27
AVAGO TECH WIRELESS IP SINGAPORE PTE
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Problems solved by technology
Receivers that use digital signal processing modules, such as linear equalizers and cancellers, are particularly sensitive to nonlinear distortion that are present in the received signals.
Severe nonlinear distortion would cause erroneous decoding of the received signals.
This stress would cause the transmitter to produce more nonlinear distortion.
Method used
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[0019]The present invention provides a method for determining nonlinear distortion of a transmitter. A test symbol sequence is transmitted from the transmitter under test as an analog output signal. The analog output signal is sampled to produce a digital output signal which represents the test symbol sequence distorted by a linear distortion sequence and by a nonlinear distortion sequence. The echo cancellation technique is used to approximately remove the test symbol sequence and the linear distortion sequence. The residual sequence is then a measure of the nonlinear distortion of the transmitter under test.
[0020]The present invention can be used to measure the nonlinear distortion of a transmitter in a gigabit transceiver of a Gigabit Ethernet communication system. For ease of explanation, the present invention will be described in detail as applied to this exemplary application. However, this is not to be construed as a limitation of the present invention.
[0021]In order to appre...
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The present invention provides a method for determining nonlinear distortion of a transmitter. A test symbol sequence is transmitted from the transmitter under test as an analog output signal. The analog output signal is sampled to produce a first sequence which represents the test symbol sequence as distorted by a linear distortion sequence and a nonlinear distortion sequence. The test symbol sequence is filtered via an adaptive filter to produce a second sequence such that the second sequence is approximately equal to the test symbol sequence as distorted by the linear distortion sequence. The second sequence is subtracted from the first sequence to produce an output sequence substantially equal to the nonlinear distortion sequence.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a continuation of U.S. patent application Ser. No. 09 / 792,763, filed Feb. 22, 2001, now U.S. Pat. No. 6,731,914 which is a continuation of PCT Application No. PCT / US99 / 25811 filed Nov. 2, 1999, which claims priority on the basis of the following provisional applications: Ser. No. 60 / 106,870 entitled “Transmitter Test for Distortion” filed on Nov. 2, 1998, Ser. No. 60 / 108,319 entitled “Gigabit Ethernet Transceiver” filed on Nov. 13, 1998 and Ser. No. 60 / 130,616 entitled “Multi-Pair Gigabit Ethernet Transceiver” filed on Apr. 22, 1999. The contents of all of the aforementioned patents and patent applications are hereby incorporated herein by reference in their entirety. Additionally, this patent application is related to U.S. Pat. No. 6,185,261.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to distortion in transmitters. More particularly, the present invent...
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Login to View More IPC IPC(8): H04B17/00G01R31/30G01R31/317G01R31/3185H04B3/23H04B3/32H04L1/00H04L1/24H04L7/02H04L7/033H04L25/03H04L25/06H04L25/14H04L25/49H04L25/497
CPCG01R31/3004G01R31/3016G01R31/31715G01R31/318502G01R31/318552G01R31/318594H04B3/23H04B3/32H04L1/0054H04L1/242H04L7/0062H04L7/0334H04L25/03038H04L25/03057H04L25/03146H04L25/03267H04L25/067H04L25/14H04L25/4917H04L25/497G01R31/3008H04L2025/03745H04L2025/03363H04L2025/03369H04L2025/03477H04L2025/0349H04L2025/03496H04L2025/03503H04L2025/03617
Inventor CREIGH, JOHN L.AGAZZI, OSCAR E.
Owner AVAGO TECH WIRELESS IP SINGAPORE PTE